Automatic pipe damper



Dec. 9, 1930. i R 1,784,608

AUTOMATIC PI PE DAMPER Filed Jan. 21, 1929 A TTORNE Y.

Q I 06 %7VENT0R. BY 7 1311M 777W, vmwm i I /UNITED STAT-ES Patented Dec. 9, 1930 PATENT o IcE BOY L. MEYERS, or JAnEsvILLE, WISCONSIN .1 AUTOMATIC rrrn DAMPER H I Application filed :ramiar el, 1929. SerialNo. 333,969..-

This inventionrelates to improvements in automaticpipe dampers.

- Sm ke pipes extending from furnaces, boilers and heaters are usually equipped with dampers to control the draft through the pipe and the ordinar damper must be manually It is,-therefore, the'prim'ary object of the present invention to provide a pipe damper by the expansion and contraction of a thermostatic member.

' A'further object of the invention is to pro vide an automatic pipe damper located. within the heated zone of a pipe and having a contractile I and expansile thermostatic operat- I ing member. influenced by the temperature of fluid passing through the pipe so that if the temperature of the fluid exceeds'a predetermined degree the damper 'willbe moved to closed position, and vice versa.

A further object of the invention is to provide an automatic pipe damper which, when in closed position, may be yieldingly moved to open position by pressure thereagainst, as

'cau sed by'blasts or by the explosion of gases within the heater, the damper being so hung that it will swing to closed position again after having beenforced open; I A' further object ofthe inventionis to providemeans in the automatic pipe damper which-will prevent'breaka'ge of the thermostatic operating memberjdue to further contraction or expansion of the same after the damper has completed its course of move. ,ment either to full open or full closed position,

. A further object ofthe invention is to provide an automatic damperof the class described in which'movements of a thermostatic spring member are transmitted to the damper through the engagement of a yielding dog with a sprocket and arranged so thatif the dog should get out of mesh with the sprocket fluid in the pipe.

it will automatically be brought into mesh again, when the associated parts are moved temperature of the .7

due to arise or fall in the A further object of the invention is to provide an automatic pipe damper with which a fluid pipe may be easily and cheaply equipped, which is strong and durable, which is efficient in operation, and which is well adapted for the purposes described.

With the above and other objects in view the invention consistsof the improved automatic pipe damper, and its parts and combinations as set forth in the claims, and all. equivalents thereof. I r

I In the accompanying drawing in which the same reference characters indicate the same parts in all of theviews:

I Fig.1 is a side View of a smoke pipe extended between a heater and a chimney and equipped with the improved automatic damper, the latter being indicated in its fullyclosed position; I r

Fig. 2 is'a side View of a portion of a smoke pipe with the automatic damper thereon in open position, the damper also being shown in a restricted partiallyclosed position;

Fig. 3 is a cross-sectional View taken 011 line 33 of Fig; 1; I I

g I is a sectional view'taken on line 44 of Fig. 3;and- I I I Fig. 5 is an enlarged fragmentary side View ofa smoke pipe with the damper in closedposition and showing the external damper mech anism, some of the latter being in section.

Referring now more particularly to the drawing, it will appear thatthe numeral 8 indicates a heater smoke pipe extending between a heater 9 and a chimney 10. Within said smoke pipe is a damper or valve 11 in the form of a metallic disc substantially medially mounted on a pivot rod 12 extending transversely through the pipe 8.

An operating shaft 13 also extends pivotally through the smoke pipe transversely of member is secured to a lug or bracket 15 projecting inwardly from an inner side wall of the pipe 8. Said thermostatic spring member is composed of two superimposed layers of metals having diiferent coeiiicients of expansion and arranged so that the application of heat thereto will cause the spring to unwind or expand, and the influence of cold will cause the spring memberto wind up or contract, such movements being communicated to the operating shaft 13 tot-u-rnitinone direction or the other.

A sprocket wheel 16 is mounted ifa'stzonl'an end port1on of the operatlng shaft 13, and 111 order to transmlt turnlng movements of the shaft 13, caused bywinding and unwinding of the thermostatic springi14 -,to the pivot rod l2 and. damper'll, the'outer end portion of said rod carries fast, at right angles thereto, a tubular member 17.- Said tub lar member is shown in detail in F ig', 5, and a cylinder 18; is loosely mounted :thereinand has a limited slid able movement. Integral with said cylinder and extending slioably through an end portion'of the member 17 is a'dog 19 engaging a tooth of the sprocket wheel '16. ;Also, one end portion of a spring 20 is connected to said dog, while the other end portion of the spring is secured about the shaft 13.

Assuming that'themdamper is closed; as

illustrated in Figs. 1,3 and 5', if theheat of iiuid within the ipe 8, forwardly of the damper, drops beilow a predetermined degree, the contraction or winding of thether mostatic spring member 14 will cause its shaft 13 and the sprocket 16 thereon to turn in a clock-wise direction in Figs. 1 and 5. As the dog 19 is engaged with a tooth of the sprocket, the dog will be turned dow11wardly,as in Fig. 2, turning the rod 12 and damper in a counter clock-wise direction, opening the damper. It may happenthat the spring 14: will continue to contract somewhat after open position has been reached, and should this occur-the spring helddog will simplyslip on the sprocket, and no strain will be thrown upon the thermostatic p I If thefiu-id in the pipe exceeds a predetermined temperature the thermostatic spring will expand and the'action'will be the reverse of that described I and the damper will be swung to closed position.

In some instances it may be desirable to limit theelosure ofisaid damper and for that purpose a. removable pin 21 is inserted through a lower openiii r-22 in the pipe 8. Then this 'is done, the damper, 011 being moved toward closed position, will engage the pin and, will behel'd'ther eby in a slightly open positiomlas in the dotted line showing in Fig. 2. If the spring 14 continues expanding somewhat, the dog will slip on the sprocket and relieve strain.

If'a blast orexplosion should occur within the heater when the damper is in closed position, the mounting of the damper will permit it to be forced open by the pressure scribed."

What I claim as my invention is: v lnThe 'eombination with a pipe, of a discshaped damper centrally pivotally mounted therein and inclined-from vertical when in closedposition, a contractileand expansile thermostatic member within the pipe, and mechanism between the thermostatic. member and the damper for transmitting certain movements of the thermostatic memberto the damper.

2. The combination with a pipe, of a damper movably mounted thereim a 'bi-meta llic thermostatic spring member within the pipe adj merit the damper and contractile and expansile, and mechanism between the spring member and the damper for transmitting certain movements of the spring memberto the damperto change 'itsposi'tion ithin "the damper vmovably moimtedtherein, a shaft extended revolubly through the pipbe, a thermostaticspring membe'r coiled a out said shaft within the pipe and connected to the.

shaft, and a connection between the shaft and the damper whereby'certain desired turning movements of the shaft are imparted to the damper.

4. The combination with apipe, of, apivot rod extended transversely therethrough, an

oval plate damper carried by said rodwithin the. pipe and movable to open or: close the pipe, a shaftextended transversely through the pipe, a sprocket mounted fast on said shaft, a thermostatic spring member'- coiled about'the shaft wvithinithe pipe and connected to the shaft, a dog member carried by the pivot rod, and means for yieldingly holding said dog iii-engagement withthe sprocket. e

5., In a smoke pipeYextended .betweena heater and a chimney, a pivot rod extended transversely through said pipe, an oval plate damper medially carried by said rod within ppe slightly forwardlyof and below said pivot rod, a. bimetallic. thermostatic, spring 3. Thefcombinatiom pipe, of a member coiled about said shaft within the pipe and secured at one end portion to the pipe and at the other end portion to said shaft, a sprocket mounted fast on an end portion of said shaft externally of the pipe, a dog yieldingly secured to an end portion of said pivot rod, and a spring connected to said dog to yieldingly hold same in engagement with the sprocket.

In testimony whereof, I aflix my signature. v

ROY L. MEYERS. 

